Average thickness of the crust is ____ Km
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The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans( oceanic crust ) and about 25 miles (32 kilometers) thick under the continents ( continental crust ).
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15 km
The geologic continents and the shallow seafloor near to their coasts, known as continental shelves, are formed by a layer of volcanic, sediment, and metamorphic rocks known as continental crust. Changes in wave propagation velocities have revealed that there is a rather significant contrast between the felsic top earth's lithosphere and the mafic lower continental crust at a certain level .
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